using resin composite Flashcards
what is the composition of composite?
principle methacrylate monomers with diluent monomers filler silane coupling agent activator pigments
what are the most common methacylate monomers?
BISGMA
urethane dimethacrylate
what is a diluent monomer?
TEGMA
what does the filler do?
gives strength and gives tooth like appearance
what is filler made of?
silica based glass + barium oxide
what does the coupling agent do?
coats fillers to allow mixing with matrix
name the common activator in composite resin?
camphorquinone
what do pigments do?
give shade
how are composites classified?
by filler size:
conventional, micro filled, hybrid
Describe micro filled composition?
high resin- filler ratio
describe macro filled composition?
high filler- resin stronger more wear resistance shrink less more opaque less vital appearance posterior
what is a hybrid compostion?
mixture of sized particles
Describe properties of resin composite?
non adhesive- requires bonding
hydrophobic
photophilic
cured to depth of 2mm
what is the main problem of composite?
polymerisation shrinkage
what are advantages of composite resin?
good wear resistance and compressive strength
command set
aesthetics
more conservative to tooth tissue
